3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $host = 'host.dupa.com'; $parts = explode('.', $_SERVER['HTTP_HOST'], 1); echo $parts[0];
Output for 5.3.0 - 7.2.0
Notice: Undefined index: HTTP_HOST in /in/kMqgI on line 5
Output for 4.3.0 - 5.2.17
Notice: Undefined index: HTTP_HOST in /in/kMqgI on line 5